单项选择题
A.16mm,333ml/min B.19mm,800ml/min C.20-30mm,2000-2500ml/min D.30-40mm,3000-3500ml/min
A.3 B.7 C.14 D.21
A.用药 B.生理盐水 C.稀肝素 D.尿激酶